CATALOGUE. 287 Bouteloua geacilis, Hook.?—Low, 6-12', densely csespitose, much branched at the base; leaves short (1-2'), flat; spike with 6-10 slender spikelets, about J' long, nearly sessile, with two to three sterile flowers or bractlets, one perfect flower, and a rudiment which is 3-awned and longer than the perfect flower. This species is related to B. curtipendula, but much smaller and more delicate.—Riley's Well, Arizona, 1874 (701) [A sparse but good forage.—J. T. R.] Bouteloua polystachya, Benth.—Culms low, csespitose (about 6-12'), smooth; leaves 1' long, acute, ciliate at the top of the sheath; racemes numerous, graceful; spikes i'-5, subsessile, 4-6" long, erect; spikelets J to ^' long; rachis compressed, margin minutely puberulent; flowers in two series on the rachis; glumes hyaline, lower one small, upper one with a short awn; palets 2-lobed, the lower with 3 awns, upper with 2,, rudiments with 3 awns, which equal those of the flower.—Arizona, 1871 and 1872; Gila Valley, 1874 (770, 352). Bouteloua polystachya, var. majoe?—I use this name provisionally to designate a grass larger in all its parts than the preceding. Culms 1-1 J° high; racemes with mostly 5-7 spikelets, which are about 1' long, rather on one side of the culm, sessile or nearly so, about 1' distant; culms some¬ what branched below, rather leafy; leaves flat, 3-4' long, scabrous on the margin. Probably this has been described as a distinct species.—Sanoita Valley, Arizona, 1874 '(691, 347). Bouteloua Humboldtiana, Griseb. ?—Under this name I have placed specimens from New Mexico, because of their correspondence to Cuban speci¬ mens of that name in the Herbarium. I do not know where the description is given. The grass is about 1J° high, upper leaf very short; raceme 2-3' long, of 4-6 spikes, each of which is about J' long, wide at the top, tapering below, of 4-6 long awned spikelets.—Camp Bowie, Arizona, 1874 (484). Bouteloua juncifolia. Lag.—Culms 1^2° high, much branched below, leafy; leaves broadly linear-lanceolate, 4-6' long, rather stiff, smooth panicle or raceme of 6-12 distant, rather coarse spikes, ^-f long, each of 5-7 spikelets; glumes lanceolate, nearly as long as the per¬ fect flower, acute, sca,brous on the mid-nerve; lower flower perfect, upper ones staminate; lower palets of perfect flower tridentate, its terminal awn